Mortar and pestle



April 15, 1930. F. G. JELLISON 1,754,438

MORTAR AND PESTLE Filed Novv 5, 1928 'fl'edenZ/Ya (702259012.

NVENTOR A; ATTORNEY l atented Apr.

UNITED STATES PATENT oFFIci:

FREDERICK G. JELLISON, OF GEORGETOWN, MASSACHUSETTS.

MORTAR AND Pns'rLn Application filed November 5, 1928. Serial No. 317,318.

as the nature of the invention is better understood, the improvement consists in the invention hereinafter described and definitely claimed.

In the drawings:

Figure 1 is a substantially central longitudinal vertical sectional view through the improvement.

Figure 2 is an elevation thereof.

Figure 3 is a detail sectional view showing the mortar turned to a position different than that disclosed by Figure 1.

Figure 4 is a perspective view looking toward the under face of the mortar.

Figure 5 is a perspective view of the shaft to which the mortar is removably attached.

As disclosed by the drawings I make use of a hollow base 1. Both the top and bottom of the base are preferably partly open and the open top is closed by a plate 2 that is secured thereon by screws or the like. This plate 2 also supports thereon an electrically operated motor 3. Neither the wiring nor the details of the motor have been illustrated as the same may be of any well known construction. The shaft 4 of the motor has fixed thereon a pinion 5 which is received in the hollow base 1 and this pinion is in mesh with a gear wheel 6 that has its upper face centrally contacted by a depending boss 7 formed with the plate 2. The center of the gear wheel 6 is provided with a square or rectangular opening to receive the square or rectangular lug 8 on a shaft 9. From the lug 8 the shaft 9 is provided with a threaded extension 10 which also passes through the gear wheel 6 and has screwed thereon a nut 11. The shaft 9 has a round head 12 which is received in a round depression in the outer face of the plate 2 and from the head the said shaft is formed with a substantially rectangular lug 13.

The lug 13 is designed to be received in a rectangular socket 1 1 in the closed base of a tubular mortar 15. The mortar has its inner wall inclined downwardly from two of its opposite sides, as indicated by the numeral 15.

Arranged around the casing of the motor 3 there is a strap 16to whose outer end there is fixedly secured a sleeve or like tubular member 17. The upper end of the member 17 is closed but the lower end is open. The sleeve or tubular member 17 on its outer face is provided with an elongated slot 18. The

sleeve is designed to have received therein one end of-the cross sectionally rounded pestle 19. A threaded and headed element 20 has its shank passed through the slot 18 and screwed in an opening in the pestle. The pestle is normally influenced in a downward direction by a spring 21 that is received in the sleeve or tubular member 17. The lower portion of the pestle is freely received in the motar 15 and the lower or outerend of the said pestle has two of its opposite sides, cut at angles to pre-- sent a sharpened end, said angle walls being indicated by the numeral 22. The active or lower end of the pestle is also formed with any desired number of angularly disposed grooves23, the object being that the walls of the said grooves contact with the material to be powdered in the mortar.

It will be apparent that when the motor is operated the mortar will be rotated by the turning of the shaft 9. Because of the angle lower walls 15 of the mortar it will be seen that each revolution thereof will cause the angle faces 22 on the ends of the pestle to be may be raised in the sleeve or tubular member 17 out of the mortar and the mortar as previously inferred may be readily removed from its connection with the lug 13 on the shaft 9. a

The construction, operation and advan tages of my improvement will, it is thought, be understood and ap reciated so that further detail description Wlll not be required but obviously I do not wish to be restricted to the precise details herein set forth and, therefore, hold 'myself entitled to make such changes therefrom as fairly fall within the scope of what I claim.

Having described the invention, I claim:

1 mortar havi its lower wall cut angularly from two, 2% its opposite sides to its end, a pestle designed to be freely receivedv in the mortar and having its active end cut angularly from two of its opposite sides, spring means influencing the pestle into the mortar, means for holding the pestle from turningand means for rotating the mortar.

2. A mortar having its, lower wall cut at a downward angle from two of its sides to the center thereof, a pestle to be received in the motar and having, its active end cut at downward angles from two of its opposite sides to the center thereof, said pestle, from its said end, having angle grooves in the outer face thereof, spring means influencing the pestle in, the direction of the mortar, means hold ng e pes le. from turning and likewis permitting the pestle to be moved a ainst the pressure oi the spring means out o the mortar, and a motor driven shaft removably connected to. the bottom of the mortar.

3, In a device for the purpose set forth, a hollow base supporting a motor thereon, gears driven by the motor, a headedsh'aft centrally journaled through the top of the base nd emova ly fix d o one of the gears, and having. a substantially rectangular lug on the topthereof, a mortar having a substantially rectangular notch to receive the lug of; the shaft. herei said. mortar having its inner wall, from tvvo of its opposite sides, in-

clinedzdownwardly tothe center, a sleeve supported by the mortar casing and having an elongated slotv therethrough, a pestle having one end received in the sleeve and its other end; designed to be received in the mortar, said last mentioned end of the pestle being cut at a downward angle from two of its, opposite sides andhaving its outer face, from its said end grooved angularly, a handle element having a shank passing through the slot in the sleeve and entering the pestle and a spring in the sleeve contacting with the pestle to ur e the same into the mortar.

n testimony whereof- I aflix my signature.

FREDE ICK G. JELLISON. 

